How to Calculate 8/12 Pitch Rafter Length

To calculate the rafter length, input either the Run or the Rise into the calculator and click calculate. The system will automatically compute the rafter length for you.

Note: "8 12 Pitch" typically refers to a slope or pitch of the roof, where 8 inches of rise occurs over 12 inches of run.

8/12 Roof Pitch Multiplier

8/12 roof pitch multiplier is 1.3333

8/12 Pitch Roof Angle

8/12 pitch roof angle is 33.69 degrees

8/12 Roof Pitch Template